A traditional white cake recipe drizzled with rainbow white chocolate ganache and topped with an edible paintbrush. Yield: Makes one 6-inch three layer cake Things you'll need Ingredients 3 cups flour 3 ½ teaspoons baking powder 2 cups sugar 1 cup unsalted butter 4 eggs 3 teaspoons vanilla extract 1 cup milk White Chocolate Glaze 1 cup white chocolate chips 1/3 cup heavy cream 1 teaspoon light corn syrup 2 teaspoons white food coloring Food coloring (pink, purple, blue, green, yellow and…